The slow cooker makes this veggie-packed beef stew super-easy and extra-savory.
Coat a large skillet with cooking spray; heat over medium-high heat. Trim any fat from beef cubes. Add half of the beef cubes. Cook and stir until brown; remove from skillet. Add the remaining beef cubes; cook and stir until brown. Drain off any fat.
Place meat in a 3 1/2- or 4-quart slow cooker. Add potatoes, carrots, onion, cream of mushroom soup, broth, and marjoram. Stir to combine.
Cover and cook on low-heat setting for 8 to 9 hours or on high-heat setting for 4 to 4 1/2 hours.
If using low-heat setting, turn cooker to high-heat setting. Stir in green beans. Cover and cook about 30 minutes more or just until beans are tender.